A RarefactionIndex object to be plotted.
characterstring giving a main title for the plot.
characterstring giving a subtitle for the plot.
logicalscalar: should the default annotation (title and x, y and z axis labels) appear on the plot?
logicalscalar: should axes be drawn on the plot?
logicalscalar: should a box be drawn around the plot?
expressionto be evaluated after the plot axes are set up but before any plotting takes place. This can be useful for drawing background grids.
expressionto be evaluated after plotting has taken place but before the axes, title and box are added.
plot() is called it for its side-effects: it results in a graphic being
displayed (invisibly returns